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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0557b0d4404eb391db290d88bd855e43c251591a5012b378f5c0de575dfd60d' 
  AND token = 'oma3JU01Mw6CixE+tqnLrks4DKL/Svw+kbIqIVItPuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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