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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce138a8b6a52f9fbe95cf74e9ec96c49a9a64031f44575cf72b9bc5c10b72530' 
  AND token = 'sOIOpmoyP8y8tVPfzQmjbxYigKG264stXmoMy7OWhH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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