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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd100b19fcbb7ef0ef35410247eb29b1dd1b4a84cd11ba210993570f66f9f49ba' 
  AND token = 'mU1vC247617AwElVw+mjaMKA5QCnyXeeiCoQIHr2cH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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