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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630ee316c6bbe9067f08237d9867db7a37aaa1a224c4942e59ba88d34afb1cb0' 
  AND token = 'acz12ViiGlbS1N6iftaT8mICIt+/3lnLfsy41Z1xv4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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