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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4eba34a13d3ec929d4e21f290ad3e65fbeb40edf709d3637b1ac3d6497616e' 
  AND token = 'ysSFXT11JQxDNTf+SZW8vzc7hiUfZgO8+vSXAf4SCLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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