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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7097626ed988cbf27a29edc630102a5f9f7342a9967ad69916a609b73e7139' 
  AND token = '2YiIE7p9dpZf44HnR8NfoidUoRnkaBGKtGAYF98H8s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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