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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc30311145dae19add3e020b1d515ead8a8bd4c09a50b660f24cbaab2bfb840' 
  AND token = '5A5LEXwAAWBzHOYxTgP/IED79SwL6CgZfZO5l4tP4TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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