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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a683ceb20a9a448527f93f500c36ee048767e9e2137a8c7f327b89c2c08f16' 
  AND token = 'UdP/GEmPLeq92DP6L388bS7DUkXy9+0Y1DdiYo6eJgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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