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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bac9f84970a1e4d9fe47b5f58212a358247deac376d1fdd286b11b32a76da9f' 
  AND token = '0AXnXz2M4L9toS06y1kcuzTEZyM5uKNIHNkv2wQg084=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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