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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e23b5980b71d2d55bcb6041395287b7a8abc65dc050e7310ffc5834c98ef28' 
  AND token = '86wexfC4Za1J8oB6dibjkvvovQCZEooLL3RDUoOyxSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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