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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178cfd21f1acffd52daa2ba3e41f86326282ee2b6d741d2343442b10398f9ffc' 
  AND token = '31ZUCSDKCjOHXV8xjpLPXUsQH4OFQry6mF5BK4R6wlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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