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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead8283faa466b4070a05ca65efda0652e12b5e3a45f116ff2e4b536d85ffbc5' 
  AND token = 'rNqSSbhcPNTvIkzc6oahvo9G6hHOXfyYdqr5fqEPUbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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