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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d1a61aa19e14bbeb20fb58b9451674e2e1041adc0c4f1835fac3e6d36381ff' 
  AND token = '9CqB8SNo+0U8SsjY+1ESuf1jVuirYCYDUejNcsOcbjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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