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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701c1b2b084c8b6d9f59661f80e16fdd1aa09c5e9533f2653e4a3613f17b0b08' 
  AND token = '02NPo9ju631CmMVWFGANK0iThvatsAmxDr95Wnjqm0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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