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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd866740a14c734b4de910d8254402e54977993195485301e6c3af19b9e5b66a0' 
  AND token = 'HAitSWHC4EhGNTc7AcZyROh82bcF6rBGXsfFmwAlNZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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