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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9c47b25c932096da3ec3de9909df5ac730a1a54efcbc8e22f132fdb8ec6795' 
  AND token = 'S6Prmt93g1zZXULl0YIEtLUowKqlK0VcW1V6GtT8dGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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