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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474a3a75f0fb5fd7a13de633c3e8bd3c5861cd679bc1ea5c450e79cd6f9ba4ee' 
  AND token = 'i0aEA+gthhk7T5A/ZAeW6LNxbgw4WMS6wZ7XreKfDA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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