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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f1f2a09aa3938b5ba6f8521769eb6f0251ed83510ccc68303051e82c28775d' 
  AND token = '0RB6JHQeodUml1XBupLzUVyxbIbnKQA3C9Rc8rumsUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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