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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ee61341d0380548678172a7e376060afae3a5d3327ebd93edf179641461703' 
  AND token = 'W+o7Rwz+O9E3lDx8419faqQU5dNG6954xV9Y6GR2aMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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