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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1652157afd65ec10cb261e6c00625749aabae90c192ea8b264588a1de65fa8' 
  AND token = 'f3KAciT/T8QgK+bhCyTnalFQ8la7VfTlLJYYLlJyLIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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