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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425c6d867ff510962f9dcff1fe412c70975e2c7518173cdca6b1eb736a8147cd' 
  AND token = 'vMo5V3nFxA2hAj/drlLhY570mtS0GjzNV6CqC1Snwek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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