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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a75a7ec4e5716e74dbf44422c67e5e908e06bb895776e66d95b0d7104e722d0' 
  AND token = 'QWhGLnlVjlHMMdoqvlxXM2L6o7LiSFA//vLRcLdRJ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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