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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef55c65e14f78fe10a4a38c20e468590779285f6ade45499e4414705e0f95aa' 
  AND token = '5RTnipbCr+Vhk7arP+1mb3k/WYNp1wFnAnJHoBuoTV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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