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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4698ecec8274476b9985abbb716f03631209ac87cd6f6080bd99f3825fe5b1e' 
  AND token = '5bWLNyrjuZvDka0suJSiFdTAswzReMpidzGjEsRAnmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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