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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb5c0e93f364c9a6bd69d03706c1696031d97e19f8b17e9767f20fba5459f0d' 
  AND token = '9YSeoMS28IpR7uBy+FTjy8AmMFMw7WlIk8vAvcIgjSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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