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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888f6669607d0dcf1da96192730c83b2bb86f9e43f2fdf9715a0d9b35df3a596' 
  AND token = 'mplYqxjAYJit5dzynKeFTumqKDYSm06JeMhSzHhRHHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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