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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69363dd3de1c383dbc2a1628d33d01908218d872a5ca490b2108dc38849b2e18' 
  AND token = 'DJxuh0BuVK5eyJQR4PEwqMM7arjybjbg64n8YxMVYKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}