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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbaad61f68a42bfd9c269ffbef91aeffef94cebe2e03609350a7f4d9c3e7926' 
  AND token = 'Ai7NZqByd2iOvO4ZFrCTMpfUq+z4Z/tvFSeZ79n+WGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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