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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866ebf9cad3d571aea5e5cfdf7ab8062f9953d4a59faec3ae63f4a9e6d1c3c4b' 
  AND token = 'MZmYofV7Qzqy6AKO9qUePUTH7uA+DWHEu1C1G1WPCM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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