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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fd76fdd173316dabcc7121fceaef322bb95a45a6807a3f25067b68f5ae3a13' 
  AND token = '9DA6Q/j0SwMcJWh36mvh8ekPCauXuG1LlhjcfHcbKSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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