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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dac8c8d1f232ba038be0930e2ea04429c501f5bbde0dac7e76bd4f62b1c6f0' 
  AND token = 'o/im1SdpMkpfbX3W4vYWQRFv5kZV1vWy0zNH8gB1oNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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