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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3def596679835ec2852fdc688091b94afe273b78447d0609f71c081a06619712' 
  AND token = 'fLnhAaNhPFQt8FwtRd3ELINb79VNnzs7SeUVyorj9DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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