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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a01a1f5846448d124ad8ab33db1576f5569069cd8ebdb43f04f717fe478948' 
  AND token = '3xFgj0E9g8K6/suhOYLZ0oIK4vFJpZTDOkirxOrcHxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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