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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83da28fdde68193e24e52d68c415926f3c51c1d489239261e55edb370114768' 
  AND token = '6aiDF1pC4FUOWaqxb7vT/JeMDC/L0FsGqU6XxPxqZ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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