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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd7e6b55a039ca2a8ebb3ac43339ebd1c50fb7e24ddbd49a24dc30e81f289c3' 
  AND token = 'ZkgKYgJH3dduZoKQ2k+9qGGo2CLGQ2rscOVU1ln/QTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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