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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c9d124c4d4e7a0649061b27270ea526fd1788fc094e8ebe6461ab0c5f24104' 
  AND token = 'dwui4Y9YUYRFdShJIIcqXswsSPRQNIeJ2Nq0WGmbg1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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