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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e70fb7796231891b798e2de2a58e2553e595f74f7bc137f503b38e0b23b7ca8' 
  AND token = 'hS4ZFlf1aJ70sj67+bonE7YMACw2Qwem5r+wRtpSVxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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