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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e0c4893396b750dad1962a1b8cc1c61545d3ea70262d2d13c0f6bc4abba661' 
  AND token = 'LyRwDy+pzGaZPEnF2cfTVLC/umTxof4b4c4Gwzaho8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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