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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6462b34ac7d68da56e6c0f44ac84647767eb5c8027855f12c38b3138f923b4c2' 
  AND token = 'GgfeK9i87EldhMcHpMPgudX126M9cL85FPVdKDrbtM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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