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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e0653090b2f2287997a9bc1ed9854ccce1d4140f682136954063f7f89547d9' 
  AND token = 'cco6zXgkH6877I7ebZblKq/pbbvNu19RgI3iimTjHjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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