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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9227c59a6c60eb3801debea71d49cdd493c2e86685f262d5e4b0e51c1f428f84' 
  AND token = 'kblM5wUcJudEvKkQbq3vYNYe1ITnqJjCD+aC3AK6ezA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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