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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc10726d71cc8d4c11b5218f06522a45cdc50101a26d05222083bac05d8be47b' 
  AND token = 'Y/m3IZZFedrr8I9QZCKHlHERcA9SDl8eINDdZxomtGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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