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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106253976120ad96f6ada4bd493b83b21f99df72af79942927f163d1404b0d8e' 
  AND token = '/9sS1GO4Qv54kT36s2opewgDBiUdnQYsNg/935LuHiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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