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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2990ba2af3a9d6b3b15961e5b5bc9dcfcbfccb155203f627ff933fd0c1ef3d7e' 
  AND token = 'Dp9Bxsn34b6syqYwurdMmzuqTB6OtTYZgXSBwNfxlds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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