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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2539168d2717003261d3e6e0418647f78393f643f1297ca6518a9061b134b8' 
  AND token = 'c6XR460SQja0STSLMFksfEauI5z3VhR6rJTmr2UPXks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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