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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13267159e5bb89b8854ee709ce3b9bbb4270cb40140ff5c8da06838be6081c9' 
  AND token = 'PBu99SNqWioHF2amG+8JpxwHeHHBYwFSP63IH6+gruM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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