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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a41f4b0f02b45ab72f0eef34bf9b326b5346368f31615ff3f9a6eeb7ebeba4' 
  AND token = '71od9I6W3j+8FHsJIZTM2B9QlUMxUViUE9ASE5f+9IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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