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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9292d3b10fd74841e914989e833b2dc0fa28bb736402b6280db80e14c6e7e17b' 
  AND token = 'FbrIGWm76zf3IbEDJxprKJAOZLLC3hU1loPif814NNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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