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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b91a00b55ac51822344e91d5512cc3a27ee11234d2b8b185537c27ada914ba' 
  AND token = 'JZ8fz2Ywgxf4TpDEs/2xD9dwOP2KMWXY63R/0Xv5Iss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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