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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdc0c20d70f3da2178059b7c5d8d90c1d60ae2e1e3130aea97ea2b922bb8d8b' 
  AND token = '07pAe4KcMXK9rr0ReYg6FtqTRgx5IQdDHOCie/Uxwyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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