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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f86982952314073596cd0221cdd709103b202440c012205ac1cbef0d1faae14' 
  AND token = '8d8qo4NH0mXjCnXZvKh1fcR4QjlSuyusyqqry53EKXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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