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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7e2f167885063e40863f30d43b60b8dff38f9f7e51c8934b6a30335ffc5986' 
  AND token = 'Fn4x+izlXuVLtEeTESalvDEukmruxbkHxuGsZGZTeDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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