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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ad4872bb67c0a9ff2723a3241b22338e9be17bc18cf1b02fcff0f7844aa228' 
  AND token = '3mSC5B/yLi5D5A9f3T0rwzh5kZXd5AnI2RCXB2cNeaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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