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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f4574e2db05e23f21bc2fa4e27d2e5ea0524f413af898c4f35e7f64feb1795' 
  AND token = 'fMjrEk5IpfMohPvkcB9+ZHREqnSPW5T7jJh0/8Davg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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