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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6f02b1b9ee7eecad868eb0d2990e91aaa618c5f710e67b158bef93774d58e4' 
  AND token = 'i5Fo97JQqpvAJsocofMff2yD90a0pb1JMmfgrOJjEt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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