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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029956070dd9859313b78c76ff92a75abb8a55c46a0dc096a59ac63c0994eb46' 
  AND token = '8Kaw8he6rd04YOwJRXxm3xlKNd1pBLJVGCtJsrhhNA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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