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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f1aecac810b978bf2d67a87af7045524c63068a5a4fc06a2030f93de6d2631' 
  AND token = 'C0fGfuIceS1sHJJZHXu+v8o4txhf/lauDVmwtft1Fv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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