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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2032a25d3cdf3c02ac39e0f92fe908d4e86072fad61ab3538f5ae50644632a94' 
  AND token = 'VHlOdPZqWpGFZ/wAkn9M2iBdIk0At7ZWobP493WtPSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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