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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0978dad5e409c1317b45d21bddbd12be95a471a69d4ba9e580fb88803b3de8e1' 
  AND token = 'dh9qY3Ss9MfAYypRBr5HIIjf9fWcgYMyrvD0iSQD9F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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