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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a1f78409d990d455d88fb22db11a1a00ca5eb55f1e1cb866efe948802424d2' 
  AND token = '9i4VoB4CTJ7qKc90bM0RD/BAs5RKxCe37A/kP4t+g64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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