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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c87dbc6d2f58d2f2a43033bad950d67ad98a5d1ef9b81aadbd52e2005bc13af' 
  AND token = 'hptKr4tc+OGWij+7oFv2g5uH6jp+ki6ny5J+xAgtXxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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