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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828e8bf708573d48b75f00dea7642364a94b0ec634d1b80d7b63dbb24ca644b6' 
  AND token = 'VzJHFrPpwMGuWH603M/pcv1aLtW2ajhb4MIOxB+ikEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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