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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17c7dfc4fb808009f8c073a928c7ffc2c683060e9fd1a66cefc09b64cac8de9' 
  AND token = '33gixmihi676XTtNGuFx29HzVX288z7Ye/RycLNSeSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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