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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bcccfc3e2b084481518ba269eb56723d3f3bd107432591140a8b7da1d8d011' 
  AND token = 'hHRPyWS2L04IiLNgUAQnvGn230TsvrnROzM3XgF5AdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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