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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9951e64ec91213c2c41d899eeeb3d15766050ee2bc49111fcf382a0fd99f7b96' 
  AND token = 'nn5AUhKdaQBQ77EJOREq7v1ZuXPtbod9UGBu2uQR7YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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