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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b86d2f95b4cf15705e8b6ed9f35228522b0ed88748e7bfe58c86e5edabb20a' 
  AND token = 'pVANT8VccUcorHWa7AsnnqjKFrICuKAWTViUR5IB8dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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