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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9009bd446bb91b583facc3bb32e96af45a8e5e4fef60d7e58ad3737abab6cc' 
  AND token = 'vA1OHLJ52sX3jk24Cz+j6DSkD4aeP2GrKrC7LYYbe1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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