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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f31c4f9350db550030b285e5d2315e140b2734a9fd913f20ac4fa8dbd54aa0b' 
  AND token = 'i1lWtwr9Qvey0aG465JvdO8Ru73E4BmtJP6tR71DtVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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