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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4c08b5a061ee57b02de2e726af9ab42920f60b51576119644125c66a7ec7bf' 
  AND token = 'I978zSB33OM7fcFfc0pxIrvz0imEC06Eq3UyITA+Efk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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