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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdd262469176b6373ee30cae443c5bda1dba50233653dfde407403bc7a4520b' 
  AND token = 'KG/Mj6vNAKgzcxC8Wkzql0yNP8CpFVdRvEkqWF6A19w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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