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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87f478f037ded47cbd9d911448913d2480bed734e1425b2b999dd4bb4671c77' 
  AND token = 'h8wU/0NJBKmn2uyk35UiOvFX89nABl0wlGSoLhHRtwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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