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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afab395843efb9656debccdc91ebea1c905c04c36832ddb07976f3f096a9a9a0' 
  AND token = 'IJ5bUDsamZiyivS2szCsfufX+bZam4VJvQt9aC1MdcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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